From Embryology

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Fig. 1. Profile reconstructions showing the spinal ganglia and their dorsal roots in the tail region of the human embryo

white - Last two lumbar ganglia

stippled - Sacral ganglia

solid black - coccygeal ganglia

It will be noted that in the period included between these two stages marked regressive changes have aflected the entire coccygeal region of the spinal cord, with complete disappearance of the last three coccygeal ganglia, in sharp contrast to the sacral region of the cord, which undergoes uninterrupted development. The reconstructions are taken from embryos No. 544, 11.5 mm, long, and No. 75, 30 mm. long, belonging to the Carnegie Collection.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: Fig 1 | Fig 2 | Fig 3 | Streeter 1919 | George Streeter | Historic Embryology Papers


Streeter GL. Factors involved in the formation of the filum terminale. (1919) Amer. J Anat. 22(1): 1-11.

Cite this page: Hill, M.A. (2024, February 21) Embryology Streeter1919-fig01.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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